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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1df76bc1194fa18a82fd9539b3f76c4b0309e3d90af809d2721ba7a4085aae' 
  AND token = 'dIe0m+DwBBl8AbRnYpeFKaclIQftBFo/2LT071qlr1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}